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% This macro source file is from the four volume series
% "TeX in Practice" by Stephan von Bechtolsheim, published
% 1993 by Springer-Verlag, New York.
% Copyright 1993 Stephan von Bechtolsheim.
% No warranty or liability is assumed.
% This macro may be copied freely if no fees other than
% media cost or shipping charges are charged and as long
% as this copyright and the following source code itself
% is not changed. Please see the series for further information.
%
% Version: 1.0
% Date: May 1, 1993
%
%
% This source code is documented in 19.2.2, p. III-78.
% Original source in file "tokens2.TEX", starting line 640.
\wlog{L: "csar.tip" ["tokens2.TEX," l. 640, p. III-78]}%
% This file DOES belong to format "texip."
\InputD{doloop.tip}
\InputD{rangetst.tip}
\InputD{compst.tip}
\InputD{strleng.tip}
\catcode`\@ = 11
\newcount\@CreateArrayCount
\def\CCreateArray #1#2#3{%
\NameEdef{#1-low}{\number#2}%
\NameEdef{#1-high}{#3}%
\ifnum #3<#2
\errmessage{\string\CCreateArray: low array boundary
\number#2 is larger than upper array boundary
\number#3}%
\fi
\DoLoop{\@CreateArrayCount}{#2}{1}{#3}{%
\NameDef{#1-\the\@CreateArrayCount}{}%
}
}
\newcount\@ConvertStringIntoArrayLength
\newcount\@ConvertStringIntoArrayCount
\def\ConvertStringIntoArray #1#2{%
\def\@ConvertArrayName{#1}%
\edef\@ConvertArrayString{#2}%
\StringLength{\@ConvertArrayString}%
\@ConvertStringIntoArrayLength = \StringLengthResult
\advance\@ConvertStringIntoArrayLength by -1
\CCreateArray{\@ConvertArrayName}%
{0}{\the\@ConvertStringIntoArrayLength}%
\@ConvertStringIntoArrayCount = 0
\expandafter\@ConvertStringIntoArray
\@ConvertArrayString\@ConvertEnd
}
\def\@ConvertStringIntoArray #1#2\@ConvertEnd{%
\CLoadArrayElementEdef{\@ConvertArrayName}%
{\the\@ConvertStringIntoArrayCount}{#1}%
\if\EmptyStringConditional{#2}%
\def\@ConvertStringIntoArrayNext{}%
\else
\advance\@ConvertStringIntoArrayCount by 1\relax
\def\@ConvertStringIntoArrayNext{%
\@ConvertStringIntoArray #2\@ConvertEnd%
}%
\fi
\@ConvertStringIntoArrayNext
}
\def\CCheckIndex #1#2{%
\expandafter\ifx\csname #1-low\endcsname\relax
\errmessage{\string\CCheckIndex: no array #1.}%
\fi
\ifnum #2<\NameUse{#1-low}%
\errmessage{Index #2 for array #1 too small.}%
\fi
\ifnum #2>\NameUse{#1-high}%
\errmessage{Index #2 for array #1 too large.}%
\fi
}
\def\CArrayAccess #1#2#3{%
\CCheckIndex{#1}{#2}%
\edef#3{\NameUse{#1-#2}}%
}
\newcount\@CArrayAccessIntervalCount
\def\CArrayAccessInterval #1#2#3#4{%
\CCheckIndex{#1}{#2}%
\CCheckIndex{#1}{#3}%
\ifnum #2>#3\relax
\errmessage{\string\CArrayAccessInterval: low index
(\PoundSignText 2) > high index
(PoundSignText 3).}%
\fi
\def#4{}%
\DoLoop
{\@CArrayAccessIntervalCount}{#2}{1}{#3}{%
\CArrayAccess{#1}{\the\@CArrayAccessIntervalCount}%
{\@CArrayAccessInterval}%
\edef#4{#4\@CArrayAccessInterval}%
}%
}
\def\CLoadArrayElement #1#2#3{%
\CCheckIndex{#1}{#2}%
\NameDef{#1-#2}{#3}%
}
\def\CLoadArrayElementEdef #1#2#3{%
\CCheckIndex{#1}{#2}%
\NameEdef{#1-#2}{#3}%
}
\newcount\@CShowArrayCount
\def\CShowArray #1{%
\DoLoop
{\@CShowArrayCount}%
{\NameUse{#1-low}}%
{1}%
{\NameUse{#1-high}}%
{\wlog{Index \the\@CShowArrayCount:
\NameUse{#1-\the\@CShowArrayCount}}}%
}
\catcode`\@ = 12
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